黄河流域渭河支流甘肃段湿地时空变化及其驱动机制研究

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中图分类号：N8 文献标识码：A 文章编号：1001－9499（2025）04-0054－05

Spatiotemporal Variations and Driving Mechanisms of Wetlands in the Wei River Tributary，Gansu Section of the Yellow River Basin

LI YijingZHOU Luqiong ZHANG Chao** （Gansu Forestry Voctech University，Gansu Tianshui741020）

AbstractThis study utilized Landsat remote sensing imagery （1990-2020）and multi-source geographic datato construct an object-oriented classification and landscape patern indices analysis framework.By integrating geographic detectors and structural equation modeling （SEM），we systematicallyrevealed the spatiotemporal evolution paterns and driving mechanisms of wetlands.The results indicate：（1）The wetland area in the study region decreased by 12.6% （annual average 0.42% ），，showing a spatial differentiation characteristic of "upstream shrinkage-midstream fragmentation-downstream anthropization"，with 2010 identified as an ecological tipping point;（2）Agricultural expansion （q=0.48） and precipitation reduction （q=0.36） were the primary driving factors，while policy interventions reduced the degradation rate by 18% （20 after2015;（3）Theecosystem service value loss was 32O million yuan/year，and the carbonstorage decline wassignificant（ ）.The study proposes that the protection of plateau valley-type wetlands should prioritize ensuring ecological flow （≥40% of the multi-year average）and establishing community co-management models，providing a scientific basis for precise wetland governance in the Yellow River Basin.Methodologically，this research achieves an innovative breakthrough in multi-model coupling for driving mechanism analysis.

Key wordstelow river basin; wei river tributary; wetland evolution; spatiotemporal variations; driving mechanisms

黄河流域生态保护国家战略背景下，渭河支流甘肃段作为西北干旱区重要生态屏障，其湿地承载着涵养水源、保持生物多样性等重要功能，是西北干旱区生态安全的关键屏障。（剩余7271字）